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Browsing ELibrary by Title
Now showing items 2408-2427 of 21934
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(1997)We have analyzed Sb in a variety of mantle-derived volcanic rocks, peridotites, and in the CI chondrite Orgueil by spark source mass spectrometry. Concentrations vary from 0.02 to 0.8 ppm in oceanic basalts (mid-ocean ridge ...
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(2004)We investigate the constraints that may be placed on earthquake epicentres without assuming a model for seismic wave speed variation within the Earth. This allows location improvements achieved using 1-D or 3-D models to ...
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(2001)The phase lag by which the Earth's body tide follows the tidal potential is estimated for the principal lunar semi-diurnal tide M2. The estimate results from combining recent tidal solutions from satellite tracking data ...
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(1996)The ratio, ν, of relative shear (S) to compressional (P) lateral seismic velocity variations is potentially an important constraint on the mineral physics of the Earth's lower mantle. Recent seismic results show that there ...
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(1987)Major intrusions of granitic rocks are found in several tectonic settings and, in all cases, crustal melts may contribute to the volumes of granitic magma. High-grade metamorphism and partial melting of the crust take place ...
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(2002)Primary Os-rich platinum-group minerals (PGM) (e.g., laurite-erlichmanite series (RuS2-OsS2) and Os-Ir-Ru alloys) are potentially the best tracers of mantle melting events, which may be unequivocally recognised during ...
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(1986)DSDP Leg 82 sampled the oceanic crust, at 9 sites, west of the MAR between 33°N and 38°N, i.e., from the Azores “mantle plume” to south of the Hayes Fracture Zone. A specific aim of this DSDP Leg was to determine if the ...
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(2002)Micas have been studied for many important and highly interesting reasons by a wide range of workers, e.g., engineers, physicists, chemists, and Earth scientists. Our focus includes only aspects related to the Earth sciences, ...
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(2002)Extension of the Ar–Ar stepped heating technique has been used to characterise the Ar, halogen (Cl, Br, I), Ca and K components in seven coated diamonds from the Aikhal kimberlite, Siberia. At least three components have ...
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(2002)Seismic reflection and/or refraction studies reveal reflective middle and lower crust and a sharp Moho (~32 km depth) beneath a broad region of the Bering Shelf between Alaska and northeast Russia. Basalt flows on Saint ...
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(1990)Major and trace element data for 375 spinel lherzolite and harzburgite xenoliths from continental basalts are used to constrain the nature and composition of the continental lithospheric mantle (CLM). The major and compatible ...
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(1995)Attempts are made to quantify cooling rates of chondrules from the microstructure of clinopyroxene and Ca-rich plagioclase. Pigeonite/diopside exsolution lamellae on (001) are frequently observed in Allende granular olivine ...
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(2001)The Tien Shan is the best example of active intracontinental mountain building in the world. In order to determine how strain has accumulated in the range, a 28 station network was deployed in the Tien Shan during 1998-2000. ...
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(1993)A suite of iron meteorites has been analysed for their content and isotopic composition of nitrogen to investigate the behaviour of nitrogen in the iron meteorite parent bodies and any constraints this can place on the ...
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(1996)If the viscosity of subducted lithosphere is described purely by temperature and pressure, it should remain considerably more viscous than the surrounding material as it descends through the upper mantle. Many dynamic ...
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(1992)Current hypotheses for the source rock of low Ca garnets hosted in mantle-derived diamonds and xenoliths range from residues of komatiite generation, to subducted serpentinite, to subducted mid-ocean ridge (MORB) harzburgite. ...
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(2002)The determination of the inner-core boundary structure is key to understanding the mechanisms of inner-core growth, iron solidification and anisotropy formation in the inner core. A waveform inversion of a worldwide data ...
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(2002)Event trees are useful frameworks for discussing probabilities of possible outcomes of volcanic unrest. Each branch of the tree leads from a necessary prior event to a more specific outcome, e.g., from an eruption to a ...
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(1998)A new concept 'gyrotropy of rocks' introduced earlier in the context, of a phenomenological theory is substantiated by constructing a model on a microlevel. This paper presents a model of a dissymmetric grainy medium with ...
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(2002)Natural aquifers are heterogeneous, and geostatistical methods are widely used to simulate the heterogeneity of aquifer properties. Due to limited available data, it is essential to integrate as much information as possible ...
Now showing items 2408-2427 of 21934